C₂H₅OH ---->H₂C=CH₂ + H₂O    (Kt=H₂SO₄,t≥140C)

H₂C=CH₂ + H₂O + [O] ---> CH₂(OH)-CH₂(OH)     (KMnO₄)

H₂C=CH₂ + 3O₂ ---> 2CO₂ + 2H₂O

H₂C=CH₂ + Br₂ ---> H₂C(Br)-CH₂(Br)

Verified answer

C2H5OH => (t,H2SO4) CH2 = CH2 + H2O

CH2 = CH2 + Br2 => CH2Br - CH2Br

3CH2 = CH2 + 2KMnO4 + 4H2O => 3CH2(OH) - CH2(OH) + 2MnO2 + 2KOH

CH2 = CH2 + 3O2 => 2CO2 + 2H2O